Piston-ring



S. D. HARTOG.

PISTON RING.

APPLICATION FILED IAN. 24, 1919.

Patented Aug. 9, 192K..

UNET T Y TENT @rtree d STEPHEN D. HARTOG, 0F ST. LOUIS, MISSOURI, ASSIGNB, BY MESNE ASSIGNMENTS,

"IO DILAND MACH WGBKS, OF ST.

SOURE. i

3l UIB, MISS'UR, A CRPRATION 0F .Il/Hg- PSTON-RENG.

Specification of Letters Patent.

Patented Aug. 3), 11921.

appuoatm 'mea January 24, 191e. serial no. 272,830.

T o all whom t may concern Be it known that l, STEPHEN D. HAR'roG, a citizen of the United States, residing. at the city of St. Louis and State of Missouri,

' have invented anew and usefui Piston-Ring,

of which the following is a specification.

rlihis invention relates to piston rings.

An object of the invention is to provide an improved piston ring having overlapping ends which, when the ring is mounted within the groove of a piston and within a cylinder, are retained close together by the side walls of the groove in which the ring is mounted and which are caused by the resiliency of the metal to press laterally against the side walls of the groove in the plston and thus form a close seal to prevent the passage 0f gas while the resiliency of the metal is also utilized to expand the ring in contact with the cylinder wall.

Another object of the invention is to provide a ring possessing the above characteristics and also constructed so that the strains are equalized or apportioned throughout the circumference of the ring, thus preventing excessive strain upon any portion of the ring when the ring is under compression on a piston and within a cylinder.

`Other objects will appear from the following description in which reference is made to the drawing illustrating one em- I bodiment of my -improved piston ring, and

in which- Figure 1 is a erspective'view of the ring.

Fig. 2 'is an e ovation looking toward one of the side edges of the ring.

Fig. 3 is an elevation looking toward the periphery of the ring.

F1 4 is an enlarged sectional view on the line 4 4 of Fig. 2.

Fi 5 is an enlarged sectional view on the l1ne 5 5 of Fig. 2, showing the spaced overlapping ends. v

My improved ring is composed of a single piece of metal split for a portion of its circumference to form two overlapping ends 1 which are separated from each other by a space 2 which is made by the implement or tool employed to split the ring. ln its expanded form the ends of the ring are separated from the adjacent shoulders on the ring by spaces 3 which permit the ring to be compressed within a cylinder in which the ring is intended to operate. As shown A of the ring.

' of a piston, the overlapping ends lof the ring are pressed close to each other so that the combined width of the overlapping ends when they are bearing against each other is equal to the width of the remaining ortion y 1t will be observed t at the reslliency of the metal is utilized in order to cause the overlapping ends 1 of the rin to press laterally against the side walls o the groove 1n the piston without interfering wlth the freedom of expansion and contract1on of the ring during operation of the piston. .The pressure of the overlapping ends 1 agamst the side walls of the groove forms a close seal to prevent passage of gas between the ends of the ring and the side walls of the groove, while at the same time the overlapping ends are so close together that no material quantity of the gas can pass through leither of the spaces 3 and the space 2. I

A groove 4 is formed in the inner side of that portion of the ring opposite the overlapping ends 1. The groove 4 may be of any desired length and should be of a depth suiiicient to permit the portion of the ring in which it is formed to yield or twist without undue resistance when the ends lare pressed together in the groove of the piston, and-to prevent excessive strains upon the ends 1 in their movement toward and away from each other and to apportion or equalize the strains throughout the circums.

the ring, and also to press laterally againstthe side walls of the groove.

A ring yof the above-described character may be manufactured economically and is more eflicientthan rin s of usual construction for the reason tat a close joint is `formed by the ring with the cylinder wall, and also with the walls of the groove in the piston in which the ring is mounted.

. l do not restrict myselfto unimportant l and unessential features of construction, but

what claim and desire to secure by Letters Patent, isz- 1. A iston ring, comprising a solld portion which is substantially equal in width to the Width of the piston groove in which the ring is to operate, andoverlapping ends 1ntegral with the solid portion extendinga' of the ring and being arranged to press laterally -against the side Walls of the piston groove; said ring having a groove in the inner side of the solid portion opposite from the overlapping ends, said groove being ot less length than the length of the solid' portion of the ring.

2. A iston ring, comprising a solid portion which is substantially equal in Width to the Width of the piston groove in which the ring is to operate` and\overlappin`g ends inte ral with the solid portion extending a su stantial portion of: the circumference of the ring and being spaced apart throughout their length, the spaced overlapping ends integral with the solid portion of the ring having a combined width equal to the Width of the solid portion of the ring; said solid portion having a groove. in the inner-side thereof of less length than the solid portion of the ring.

STEPHEN D. HARTOG. 

